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Re: 1999 Nissan Altima MAP sensor location
The MAP sensor is located on the driver's side of the engine compartment next to the air filter housing and shock tower.
It is a small plastic component with one vacuum hose coming off of it and an electrical connector that has two wires. It might be advantageous to write in and let me and/or other techs know what the symptoms are prior to replacing the sensor. Sometimes just replacing the part is a waste of money. The fact that the code has indicated the problem is the MAP sensor, doesn't mean it is bad. As an example, check to see if the Vacuum hose is secure and not disconnected or split at either end.
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The MAP sensor is located on the driver's side of the engine compartment next to the air filter housing and shock tower. It is a small plastic component with one vacuum hose coming off of it and an electrical connector that has two wires. . Sometimes just replacing the part is a waste of money. The fact that the code has indicated the problem is the MAP sensor, doesn't mean it is bad. As an example, check to see if the Vacuum hose is secure and not disconnected or split at either end. Good luck.Here's what it looks like.
He's right both and the code is the EGR valve. The car won't run with the EGR valve removed but it may be disabled some way. Most of the time EGR vales leak or the senser line stopps up. There's a small medal ine coming up the the EGR senser from the exhaust and connects to the senser this line stops up and the senser knows something aught to be happing and it doesn't so it turns the light on. Your mechanic is right it's not hurting anything but it makes the light on. It can be fixed but it'll not run much different.
The problem is in the map sensor circuit, it could be solenoid valve. Check the vacum line that goes to the MAP sensor.
From the B14 Factory Service Manual, has a procedure for checking the MAP/BARO
solenoid valve when P1105 is tripped. It is rather complex, and you
will need a volt meter, but...
1- Warm up the car and pull the vacuum hose connected to the MAP/BARO
switch solenoid with the engine idling. There should be vacuum there (~
-20in Hg). If NG, replace the hose.
2- Check the vacuum hose between the Absolute Pressure Sensor and the
solenoid for splits/cracks and clogging (blow through it).
3- With the engine off, disconnect the solenoid electrical connector.
Turn the ignition switch on. Check the voltage between terminal 2 (brown
wire) and ground. It should be 12v (battery voltage). If no voltage,
check the 10a fuse #21.
4- Check Absolute Pressure Sensor. Remove the sensor with its wiring
connected. (Located near the top of the firewall next to the cruise
control actuator [disk-shaped on a bracket]). Remove the hose and turn
the ignition on. Voltage between terminal #2 (white wire) and ground
should be 3.2-4.8v. Apply a vacuum to the hose and the voltage should be
1-1.4v lower than the first reading. If NG, the sensor is bad.
5- Check the solenoid. Remove the solenoid electrical connector and
hoses and check the air passage continuity by applying 12v to the
connections. With 12v on, there should be continuity between the two
close hose connections, and no connection between the lone connector and
the double connection closest to it. With no voltage applied it should
be the opposite (no continuity between the close ones, and continuity
between the far one and the closest double one). If NG the solenoid is
It's a MAP (Manifold Absolute Pressure) sensor. Go to Checker, or NAPA, or PEP Boys and look at the replacement part - then you can find it under the hood. Probably mounted on the firewall. First check visually for a vacuum hose that may have fallen off (or split) on or near the MAP sensor.
1st, Nissan had a recall on Crank position sensors for 2002-2006 Altima's. Check with you dealer before you go doing any repairs. You may discover you can get your car repaired at no charge. NHTSA Campaign ID number :O7V527000
Symptom: Erratic behavior. Stalling and no starts and very difficult to diagnose due to the time frame in which the component actually malfunctions. The warranty should not be limited to the original owner.
I would also need more specifics as to which engine you have so I might assist you in where the location of the sensor is. The Altima had a 4 and a 6 cyl engine offered that year.